CN101594304B - Method for preventing stack system from generating loop and member equipment in stack system - Google Patents
Method for preventing stack system from generating loop and member equipment in stack system Download PDFInfo
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- CN101594304B CN101594304B CN2009100884853A CN200910088485A CN101594304B CN 101594304 B CN101594304 B CN 101594304B CN 2009100884853 A CN2009100884853 A CN 2009100884853A CN 200910088485 A CN200910088485 A CN 200910088485A CN 101594304 B CN101594304 B CN 101594304B
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Abstract
The invention discloses a method for preventing the stack system from generating a loop and member equipment in the stack system. The method comprises the following steps that: the member equipment in the stack system receives a message from a stack port and judges whether the received message is a known unicast message; if the received message is a known unicast message, the member equipment in the stack system forwards the message; and otherwise, the member equipment in the stack system detects the loop in the received message and discards the received message if loop generation is detected or forwards the received message if loop generation is not detected. The method can prevent a reoriented message from being discarded by mistake when the reoriented message receives the loop detection and avoid influences on the effect of loop detection.
Description
Technical field
The present invention relates to the technology of piling up in the data communication network field, be specifically related to a kind of pile system that prevents and produce the method for loop and the member device in a kind of pile system.
Background technology
Along with the rapid increase of network size, the technology of piling up is arisen at the historic moment.The technology of piling up is meant two or many network equipments is coupled together through stacking opening, forms pile system.From in logic, the network equipment that is stacked is equivalent to same equipment, and the user management pile system is just as equipment of management.
Fig. 1 is the pile system structural representation of a kind of 4 equipment stackings in the prior art.As shown in Figure 1, pile system comprises a plurality of through piling up many network equipments that cable links together, and these network equipments are called member device.Each member device is provided with two stacking opening at most, is called stacking opening 1 and stacking opening 2 respectively.Each stacking opening is polymerized by a plurality of member ports.For adjacent two device A and B, the stacking opening 1 of A and the stacking opening 2 of B link to each other.
In pile system; When the topology of pile system changes; Each member device is according to the connection situation of current topology; The shortest path of this equipment of calculating between other member device, thus the message that obtains from this equipment to other member device from which stacking opening of this equipment forwards.Then, generate forwarding route table according to the shortest path that calculates.
Topology connection situation with among Fig. 1 is an example, and suppose that equipment 1 calculates this equipment and is specially to the shortest path between other member device: equipment 1 is path 12 to the shortest path between the equipment 2, and message slave unit 1 is walked stacking opening 1 to equipment 2 so; Equipment 1 is that path 12 adds path 23 to the shortest path between the equipment 3, and message slave unit 1 is walked stacking opening 1 to equipment 3 so; Equipment 1 is path 41 to the shortest path between the equipment 4, and message slave unit 1 is walked stacking opening 2 to equipment 4 so.Equipment 1 needn't be walked stacking opening to self.Generate the forwarding route table of equipment 1 as shown in table 1 according to the result of calculation of this shortest path.And then the hardware forwarding table item is set based on forwarding route table, guarantee that message can forward via correct stacking opening.
| Destination device | Equipment 1 | Equipment 2 | Equipment 3 | Equipment 4 |
| The stacking opening of selecting | ?—— | Stacking opening 1 | Stacking opening 1 | Stacking opening 2 |
Table 1
After message gets into pile system from the pile system outside; Search hardware forwarding table by message incoming interface place equipment; Confirm destination device and the outgoing interface of message in pile system, and then confirm to transmit the stacking opening of this message, then message is sent to destination device through the stacking opening of confirming.Before sending, also need on message, add and pile up heading, this piles up heading and comprises source device information, incoming interface information, destination device information and outgoing interface information.
, member's equipment during the message of other member device,, judges whether self is the destination device of message in receiving from pile system through stacking opening according to the destination device information that message carries; If then message is sent to the pile system outside from outgoing interface; If not, destination device information searching self hardware forwarding table and the continuation of then carrying according to message are transmitted to the message destination device.
In pile system, message need be transmitted along the shortest path between the source and destination, if the message that certain member device sends through stacking opening 1, the stacking opening 2 from oneself receives again, and sends from stacking opening 1 once more, then forms loop; The perhaps message that sends through stacking opening 1 of certain member device around after the circle, is received from the stacking opening 1 of oneself again in pile system, then also forms loop.The phenomenon of this message Cheng Huan can cause broadcast storm, thereby available bandwidth in the system is exhausted, and makes whole system unavailable.
In order to prevent message Cheng Huan, the loop inspection can be set in pile system, produce loop to prevent pile system.For example, a kind of loop test mode is each member device when receiving the message from other member device, according to the source device information that message carries, judges whether the source device of the message that receives is self, if, dropping packets then, otherwise normally transmit.
But this loop test mode also is not suitable for the pile system that is mounted with the application subcard.Fig. 2 is articulated in the sketch map on the stacked system equipment 3 shown in Figure 1 for using subcard.This uses subcard can be for application controls gateway (ACG, Application Control Gateway) subcard, such as the safe subcard of intrusion prevention system (IPS, Intrusion Prevention System) subcard, or the like.Using subcard is each member device service in the whole pile system.Need use subcard when certain member device and handle message, when using subcard not on this member device, then this member device arrives message redirecting through the mode that is redirected and uses subcard place member device.After using subcard and handling message, use subcard place member device and be message and confirm destination device and outgoing interface and transmit.
Referring to Fig. 2, to suppose to use subcard and be articulated on the equipment 3, flow slave unit 2 gets into, and needs to use the processing of subcard, is forwarded to equipment 1 after treatment again.In this case; After equipment 2 receives message; Inserting equipment of itself information in the header as source device information for piling up of message interpolation; Message is redirected to the processing that receives the application subcard on the equipment 3, and after using the subcard processing, equipment 3 is searched destination device and outgoing interface for message and is transmitted.Suppose that slave unit 3 walks the stacking opening 2 of equipment 3 to equipment 1, message is transmitted back on the equipment 2 through stacking opening 2 so.Because the source device information of message is constant usually in the repeating process, this moment, equipment 2 was received the message of source device for self from stacking opening 1, and equipment 2 will abandon this message, thereby leads to errors generation.
It is thus clear that the above-mentioned pile system that prevents produces the loop scheme, possibly cause message when accepting the loop inspection, to be abandoned by mistake through being redirected to the service subcard processing, therefore be not suitable for pile system with service subcard.
Summary of the invention
In view of this, the invention provides a kind of pile system that prevents and produce the method for loop, can avoid when accepting the loop inspection, being abandoned by mistake through the message that is redirected to the service subcard processing.
Member device in the pile system receives message through stacking opening, when the reception message is the known unicast message, the reception message is transmitted processing; When the reception message is in broadcasting packet, multicast message or the unknown unicast message any one; The reception message is carried out the loop inspection,, then abandon the message that receives if detect the generation loop; If do not detect the generation loop, then the reception message is transmitted processing;
Wherein, judge institute's message that receives whether for the known unicast method of message by: do not carried unknown unicast and identify when receiving message, and be not broadcasting packet, neither multicast message, then the judgement message that receives is the known unicast message;
Saidly the reception message carried out loop inspection comprise:
The source device information that member device carries according to the reception message; Whether the source device of judging the message that receives is self; If; Then confirm to produce loop; Wherein, Said source device information is recorded in piles up in the heading, and the said heading that piles up is that the incoming interface place member device of message is that message adds;
Whether the stacking opening of judging this institute's reception message of actual reception is that this institute receives the stacking opening of the source device of message to the correspondence of the shortest path between self, if not, then confirm the generation loop.
This method further comprises: search the member device of destination device and outgoing interface for message, when destination device that does not find unicast message and outgoing interface, confirm that this unicast message is the unknown unicast message, for the unknown unicast message is stamped the unknown unicast sign.
This method further comprises: member device calculates the shortest path of self other each member device in the pile system according to current topological connection situation after the topology of pile system is confirmed; According to shortest path result of calculation, issue corresponding acl rule to self each stacking opening respectively;
The acl rule that issues to stacking opening x comprises following 4 types of acl rules:
The matching condition of first kind acl rule by: the highest order of target MAC (Media Access Control) address of reception message be 1, and the source device of the message that receives is a stacking opening x place equipment;
The matching condition of second type of acl rule by: the highest order of target MAC (Media Access Control) address of reception message be 1, and the source device of the message that receives is each member device that stacking opening x connects through non-shortest path;
The matching condition of the 3rd type of acl rule by: is received message and carry unknown unicast sign, and the source device of the message that receives is that stacking opening x belongs to equipment;
The matching condition of the 4th type of acl rule by: is received message and carry unknown unicast sign, and the source device of the message that receives is each member device that stacking opening x passes through non-shortest path connection;
Said judge institute's message that receives whether by the operation of known unicast message and said to the reception message carry out the operation that loop checks and comprise: according to the acl rule that issues for the stacking opening of actual reception message; Judge the message that receives whether be complementary with any acl rule wherein; If then abandon the message that receives; Otherwise, the reception message is transmitted processing.
This method further comprises: member device issues all relevant acl rules to self each stacking opening respectively when initialization; The acl rule that issues to stacking opening x comprises following 2 types of acl rules:
The matching condition of a class acl rule by: the highest order of target MAC (Media Access Control) address of reception message be 1, and the source device of the message that receives is to be each equipment of pile system configuration in advance;
The matching condition of b class acl rule by: is received message and carry unknown unicast sign, and the source device of the message that receives is each equipment that disposes for pile system in advance.
Each member device calculates the shortest path of self other each member device in the pile system according to current topological connection situation after the topology of pile system is confirmed; According to shortest path result of calculation, enable a class acl rule effective acl rule in the b class acl rule that neutralizes;
The effective acl rule that enables for stacking opening x comprises:
In a class acl rule, matching condition by the reception message target MAC (Media Access Control) address highest order by 1 and the source device of reception message be the acl rule of stacking opening x place equipment;
In a class acl rule, matching condition by the reception message target MAC (Media Access Control) address highest order by 1 and the source device of reception message be the acl rule of each member device that stacking opening x connects through non-shortest path;
In the b class acl rule, matching condition by the reception message source device that carries unknown unicast sign and institute's reception message belong to the acl rule of equipment for stacking opening x;
In the b class acl rule, matching condition by the reception message source device that carries unknown unicast sign and institute's receptions message be the acl rule that stacking opening x passes through each member device of non-shortest path connection;
Said judge institute's message that receives whether by the operation of known unicast message and said to the reception message carry out the operation that loop checks and comprise: according to the effective acl rule that enables for the stacking opening of actual reception message; Judge the message that receives whether be complementary with any effective acl rule wherein; If then abandon the message that receives; Otherwise, the reception message is transmitted processing.
The present invention also provides a kind of pile system that prevents to produce the stack member apparatus of loop, can avoid being abandoned by mistake when accepting the loop inspection through the message that is redirected to the service subcard processing.
This member device comprises: message process unit, loop inspection unit and retransmission unit;
Said message process unit is used to the message interpolation that is received from the pile system outside and piles up heading, writes down source device information in the heading said piling up;
Said loop inspection unit is used for receiving message through stacking opening, when the reception message does not carry the unknown unicast sign; And not broadcasting packet; Neither multicast message, judge that then the message that receives is the known unicast message, institute's reception message is sent to said retransmission unit; When the reception message is in broadcasting packet, multicast message or the unknown unicast message any one; The reception message is carried out the loop inspection; The source device information of carrying based on said reception message; Whether the source device of judging the message that receives is the place member device, if then confirm to produce loop; Judge stacking opening that this institute of actual reception receives message whether by the source device of institute's receptions message to the stacking opening that belongs to the shortest path correspondence between the member device; If not; Confirm to produce loop,, then abandon the message that receives if confirm to produce loop; If do not detect the generation loop, then institute is received message and send to said retransmission unit;
Said retransmission unit is used for the message that is received is transmitted processing.
Wherein, Said message process unit is further used for searching destination device and outgoing interface for message, if do not find the destination device and the outgoing interface of unicast message; Confirm that then this unicast message is the unknown unicast message, for the unknown unicast message is stamped the unknown unicast sign.
Said loop inspection unit comprises and piles up that topography module, ACL issue module, ACL is provided with module and inspection module;
The said topography module that piles up; Be used for after the topology of pile system is confirmed; Calculate place member device shortest path between other each member device in the pile system according to current topological connection situation, shortest path result of calculation is sent to said ACL issue module;
Said ACL issues module, is used for according to shortest path result of calculation, confirms the corresponding acl rule of each stacking opening of place member device, and is handed down to said ACL module is set;
The acl rule that stacking opening x is corresponding comprises following 4 types of acl rules:
The matching condition of first kind acl rule by: the highest order of target MAC (Media Access Control) address of reception message be 1, and the source device of the message that receives is a stacking opening x place equipment;
The matching condition of second type of acl rule by: the highest order of target MAC (Media Access Control) address of reception message be 1, and the source device of the message that receives is each member device that stacking opening x connects through non-shortest path;
The matching condition of the 3rd type of acl rule by: is received message and carry unknown unicast sign, and the source device of the message that receives is that stacking opening x belongs to equipment;
The matching condition of the 4th type of acl rule by: is received message and carry unknown unicast sign, and the source device of the message that receives is each member device that stacking opening x passes through non-shortest path connection;
Said ACL is provided with module, is used to receive said ACL and issues the corresponding acl rule of each stacking opening that module issues, and be set to corresponding stacking opening respectively;
Said inspection module is used for receiving message through stacking opening, according to the acl rule that the stacking opening that be this message of actual reception is provided with, judgement the message that receives whether be complementary with any acl rule wherein, if abandon the message that receives; Otherwise, institute is received message sends to said retransmission unit.
Perhaps, said loop inspection unit comprises that ACL issues module and ACL is provided with module;
Said ACL issues module, is used for when initialization, all corresponding relevant acl rules of each stacking opening in the member device of place is handed down to said ACL module is set; All relevant acl rules that stacking opening x is corresponding comprise following 2 types of acl rules:
The matching condition of a class acl rule by: the highest order of target MAC (Media Access Control) address of reception message be 1, and the source device of the message that receives is each equipment for the pile system configuration;
The matching condition of b class acl rule by: is received message and carry unknown unicast sign, and the source device of the message that receives is each equipment that disposes for pile system;
Said ACL is provided with module and is used to receive said ACL and issues all corresponding relevant acl rules of each stacking opening that module issues, and is set to corresponding stacking opening respectively.
Said loop inspection unit also comprise pile up topography module with the inspection module;
The said topography module that piles up; Be used for after the topology of pile system is confirmed; Calculate place member device shortest path between other each member device in the pile system according to current topological connection situation, shortest path result of calculation is sent to said ACL issue module;
Said ACL issues module and is further used for, and when receiving said shortest path result of calculation, according to shortest path result of calculation, confirms a class acl rule effective acl rule in the b class acl rule that neutralizes, and notifies said ACL that module is set;
Effective acl rule of confirming for stacking opening x comprises:
In a class acl rule, matching condition by the reception message target MAC (Media Access Control) address highest order by 1 and the source device of reception message be the acl rule of stacking opening x place member device;
In a class acl rule, matching condition by the reception message target MAC (Media Access Control) address highest order by 1 and the source device of reception message be the acl rule of each member device that stacking opening x connects through non-shortest path;
In the b class acl rule, matching condition by the reception message source device that carries unknown unicast sign and institute's reception message belong to the acl rule of member device for stacking opening x;
In the b class acl rule, matching condition by the reception message source device that carries unknown unicast sign and institute's receptions message be the acl rule that stacking opening x passes through each member device of non-shortest path connection;
Said ACL is provided with module and is further used for, and when receiving when issuing the notice of module from said ACL, enables the effective acl rule that is provided with into each stacking opening;
Said inspection module is used for receiving message through stacking opening, according to effective acl rule that the stacking opening that be this message of actual reception is provided with, judgement the message that receives whether be complementary with any effective acl rule wherein, if abandon the message that receives; Otherwise, institute is received message sends to said retransmission unit.
Visible according to above technical scheme; Use the present invention through to comprising service subcard; Need the stacked environment of re-orientation processes to analyze discovery, the message that is redirected to service subcard acceptance processing is the known unicast message, and the forward-path of known unicast message in pile system confirmed; Can not cause loop, therefore need not the known unicast message is carried out the loop inspection.Therefore, the present invention only carries out the loop inspection to broadcasting packet, multicast message and unknown unicast message, thereby avoids being dropped when accepting the loop inspection through the message after the re-orientation processes, and can not influence loop inspection effect.
Description of drawings
Fig. 1 is a kind of pile system structural representation of 4 equipment stackings.
Fig. 2 is a kind of sketch map of using on the equipment 3 that subcard is articulated in pile system shown in Figure 1.
Fig. 3 realizes preventing that for a kind of acl rule that adopts in the embodiment of the invention pile system from producing the method flow diagram of loop.
Fig. 4 realizes preventing that for the another kind of acl rule that adopts in the embodiment of the invention pile system from producing the method flow diagram of loop.
Fig. 5 is the chain topology that forms after the change in topology among Fig. 2.
Fig. 6 is the structural representation of member device in the embodiment of the invention.
Fig. 7 is the structural representation of Fig. 6 intermediate ring road inspection unit 62.
Embodiment
Below in conjunction with the accompanying drawing embodiment that develops simultaneously, describe the present invention.
For having service subcard and the pile system of redirected demand being arranged, being redirected to the flow that service subcard handles is the flow that message characteristic and pre-defined rule are complementary, and this flow has known message characteristic.And under this particular environment of the pile system with service subcard, the flow that is redirected to service subcard must be a unicast message.Therefore, in having the pile system of service subcard, the unicast message that only possesses known message characteristic is the known unicast message, the situation that service subcard is accepted processing can occur being redirected to.
Through above-mentioned to having the application subcard; And there is the stacked environment of redirected demand to analyze discovery; The message that is redirected to the service subcard processing is the known unicast message; Therefore, the present invention only otherwise the known unicast message is carried out the loop inspection can avoid being dropped when accepting the loop inspection through the message that is redirected to after service subcard is handled.And; Because in pile system; The known unicast message can be transmitted along shortest path, and this shortest path is stack system topological determined optimal path when setting up, so the forward-path of known unicast message in pile system can not cause loop; The known unicast message not being carried out the loop inspection so can not influence loop inspection effect yet, can reach equally to prevent that pile system from producing the purpose of loop.
Based on above-mentioned thought, the anti-loops generation scheme that the embodiment of the invention provides is: member device in the pile system receives the message from other member device in the pile system, judge the message that receives whether be the known unicast message; If then the reception message is transmitted processing; Otherwise, the reception message is carried out the loop inspection, if detect the generation loop, then abandon the message that receives, if do not detect the generation loop, then the reception message is transmitted processing.
This scheme is not only applicable to have the pile system of service subcard, and is applicable to the pile system with service subcard.Be not only applicable to the pile system of ring topology, also be applicable to the pile system of other than ring type topology.
Wherein, above-mentioned member device judges whether institute's message that receives is whether the operation of known unicast message can be broadcasting packet, multicast message or the realization of unknown unicast message through judging message.Specifically:
Broadcasting packet and multicast message ratio are easier to identification, can judge whether message is broadcasting packet and multicast message according to purpose medium access control (MAC) address of message.If the highest order of the target MAC (Media Access Control) address of message is 1, then this message is broadcasting packet or multicast message.
The unknown unicast message also belongs to unicast message, is that with the difference of known unicast message the member device in the pile system can not find the destination device and the outgoing interface of unknown unicast message from transmit.For the ease of each member device identification unknown unicast message; In the present embodiment; Search the member device of destination device and outgoing interface for message; When destination device that does not find certain unicast message and outgoing interface, confirm that then this unicast message is the unknown unicast message, for the unknown unicast message is stamped the unknown unicast sign.It is piling up in the heading of message interpolation that this unknown unicast sign can be arranged on pile system.The said member device of searching destination device and outgoing interface for message possibly be a message incoming interface place member device, also possibly be service subcard place member device.
So; The message that receives from stacking opening when member's equipment do not carry the unknown unicast sign and according to target MAC (Media Access Control) address judge the message that receives neither broadcasting packet or multicast message; Can confirm that then this message is the known unicast message, need not carry out the loop inspection it.And when the reception message is in broadcasting packet, multicast message or the unknown unicast message any one, all need carry out the loop inspection.
In the present embodiment, the operation of loop inspection can be passed through the source device information realization of inspection message, specifically:
Message incoming interface place member device can pile up heading for message adds, and in piling up heading, writes down source device information and incoming interface information; If message incoming interface place member device has also been confirmed destination device and outgoing interface for message, also can in piling up heading, write down destination device information and outgoing interface information.Wherein, source device information and destination device information are the sign of equipment in pile system, are called equipment Mod, and source device information can be designated as SrcMod, and destination device information is designated as Destmod.
So when loop is checked, member device is according to the SrcMod that the reception message carries, and judges whether the source device of received broadcast/multicast/unknown unicast message ("/" expression or) is self, if then confirm to produce loop.This checked operation can avoid member device to receive the message that oneself sends.
In reality,, also produced loop if member device is received identical broadcast/group broadcast/unknown unicast message from stacking opening 1 and stacking opening 2.In order to prevent the generation of this situation; Loop checked operation of the present invention further comprises: the stacking opening that member device is judged actual reception broadcast/group broadcast/unknown unicast message whether by the source device of reception message to the corresponding stacking opening of the shortest path between self; If not, then confirm to produce loop.
When reality is implemented, can abandon list item through in each member device, the source being set, realize loop inspection and the corresponding operation of loop check result to broadcast/group broadcast/unknown unicast message.Table 2 is provided with signal for the source of equipment 1 among Fig. 2 abandons list item." Y " expression in the table 2 abandons, and " N " expression does not abandon.
| Source device | Equipment 1 | Equipment 2 | Equipment 3 | Equipment 4 |
| Stacking opening 1 | Y | N | N | Y |
| Stacking opening 2 | Y | Y | Y | N |
Table 2
The source abandons each stacking opening that has write down member device in the list item how source device is handled for the broadcast/group broadcast/unknown unicast message of self, and how source device is handled for the broadcast/group broadcast/unknown unicast message of other member device.With table 2 is example, when equipment 1 when stacking opening 1 receives the broadcast/group broadcast that source device is an equipment 1/unknown unicast message, the source of searching abandons list item, finds corresponding be operating as " Y ", then abandons the message that receives.Again for example, when equipment 1 receives the broadcast/group broadcast that source device is an equipment 4/unknown unicast message from stacking opening 1, then abandon the message that receives.
Source shown in the employing table 2 abandons list item and realizes that the present invention need carry out the identification of message classification earlier, and the employing source abandons list item broadcast/group broadcast/unknown unicast message is carried out the loop inspection again.In reality, the decision operation of known unicast message and loop checked operation can adopt the coupling acl rule to realize.
Fig. 3 realizes preventing that for a kind of acl rule that adopts in the embodiment of the invention pile system from producing the method flow diagram of loop.As shown in Figure 3, this flow process may further comprise the steps:
Step 301: each member device when for example pile system electrifying startup, or stack system topological changes, calculates the shortest path of self other each member device in the pile system according to current topological connection situation when stack system topological is confirmed.
Step 302: member device generates forwarding route table according to shortest path result of calculation, according to forwarding route table the hardware forwarding table item is set.
This hardware forwarding table item is that message is in the inner forwarding rule of being followed of transmitting of pile system.The mode that generates forwarding route table according to shortest path is the known technology means, does not detail here.
Step 303: member device is according to shortest path result of calculation, and the stacking opening 1 to self issues corresponding acl rule with stacking opening 2 respectively.Step 302 and 303 execution sequence are in no particular order.
The acl rule that issues to stacking opening x (x is 1 or 2) comprises following 4 types of acl rules, and the matching treatment of all kinds of acl rules is operating as: abandon.
Said 4 types of acl rules comprise:
The matching condition of first kind acl rule by: the highest order of target MAC (Media Access Control) address of reception message be 1, and the source device of the message that receives is a stacking opening x place equipment;
The matching condition of second type of acl rule by: the highest order of target MAC (Media Access Control) address of reception message be 1, and the source device of the message that receives is the member device that stacking opening x connects through non-shortest path; The quantity of this second type of acl rule can be for a plurality of, and the member device sum is relevant in concrete quantity and stacking opening x member device and the pile system through the shortest path connection;
The matching condition of the 3rd type of acl rule by: is received message and carry unknown unicast sign, and the source device of the message that receives is that stacking opening x belongs to equipment;
The matching condition of the 4th type of acl rule by: is received message and carry unknown unicast sign, and the source device of the message that receives is the member device that stacking opening x passes through non-shortest path connection; The quantity of the 4th type of acl rule can be for a plurality of, and the member device sum is relevant in concrete quantity and stacking opening x member device and the pile system through the shortest path connection.
Be example with equipment among Fig. 21 still, equipment 1 issues 4 ACL to stacking opening 1, is respectively:
ACL1 is first kind acl rule, its matching condition by: the highest order of purpose MAC of reception message be 1, and the source device of the message that receives is an equipment 1;
ACL2 is second type of acl rule, its matching condition by: the highest order of purpose MAC of reception message be 1, and the source device of the message that receives is an equipment 4; Because equipment 1 is walked the stacking opening 2 of equipment 1 to the shortest path of equipment 4, do not walk stacking opening 1;
ACL3 is the 3rd a type of acl rule, its matching condition by: is received message and carry unknown unicast sign, and the source device of the message that receives is an equipment 1;
ACL4 is the 4th a type of acl rule, its matching condition by: is received message and carry unknown unicast sign, and the source device of the message that receives is an equipment 4.
Wherein, the source device matching condition in every acl rule possibly be a Mod value.Therefore for multicore sheet equipment, its equipment Mod value is a plurality of, and the source device matching condition in every acl rule can be a Mod value scope.The Mod value scope of each equipment is predefined.For example, the Mod value scope of preset equipment 1 is A～D, and then the matching condition of ACL1 is: the highest order of purpose MAC=1, and SrcMod=A～D.
Step 304: member device receives the message from other member device in the pile system; According to the acl rule that issues for the stacking opening of actual reception message; Judge the message that receives whether be complementary with any acl rule wherein, if then execution in step 305; Otherwise, execution in step 306.
Step 305: abandon the message that receives, this flow process finishes.
Step 306: member device is transmitted processing based on self hardware forwarding table item to the reception message, and this flow process finishes.
So far, this flow process finishes.
Visible from the flow process shown in Fig. 3, this scheme is after topology forms, and issues acl rule according to topology connection situation, and these acl rules all are effective acl rules.In this case, when change in topology, all need generate and issue the effective acl rule that is applicable to current topological connection situation once more.Issue the time in order further to optimize; Make full use of comparatively sufficient ACL resource, each member device can be when initialization, issues all possible acl rules to self stacking opening x;, topology, enables effective acl rule after confirming according to current topological connection situation.Idiographic flow is referring to Fig. 4.
Fig. 4 realizes preventing that for the another kind of acl rule that adopts in the embodiment of the invention pile system from producing the method flow diagram of loop.This flow process issues the execution mode of all possibility ACL when showing initialization.As shown in Figure 4, this flow process comprises the steps:
Step 401: each member device issues all relevant acl rules to self each stacking opening respectively when initialization; The acl rule that issues to stacking opening x comprises following 2 types of acl rules, and the matching treatment of each acl rule is operating as: abandon.
Said 2 types of acl rules comprise:
The matching condition of a class acl rule by: the highest order of target MAC (Media Access Control) address of reception message be 1, and the source device of the message that receives is to be each equipment of pile system configuration in advance; Wherein, each equipment for the pile system configuration is possibly add the equipment that piles up in advance, but before piling up topology formation, these equipment can't be called member device.The number of this a class acl rule equals the equipment sum for the pile system configuration.
The matching condition of b class acl rule by: is received message and carry unknown unicast sign, and the source device of the message that receives is each equipment that disposes for pile system in advance; The number of this b class acl rule equals the equipment sum for the pile system configuration.
Be example with equipment among Fig. 21 still, equipment 1 issues 8 ACL to stacking opening 1, is respectively:
ACL_a1 is a class acl rule, its matching condition by: the highest order of purpose MAC of reception message be 1, and the source device of the message that receives is an equipment 1;
ACL_a2 is a class acl rule, its matching condition by: the highest order of purpose MAC of reception message be 1, and the source device of the message that receives is an equipment 2;
ACL_a3 is a class acl rule, its matching condition by: the highest order of purpose MAC of reception message be 1, and the source device of the message that receives is an equipment 3;
ACL_a4 is a class acl rule, its matching condition by: the highest order of purpose MAC of reception message be 1, and the source device of the message that receives is an equipment 4;
ACL_b1 is b class acl rule, its matching condition by: is received message and carry unknown unicast sign, and the source device of the message that receives is an equipment 1;
ACL_b2 is b class acl rule, its matching condition by: is received message and carry unknown unicast sign, and the source device of the message that receives is an equipment 2;
ACL_b3 is b class acl rule, its matching condition by: is received message and carry unknown unicast sign, and the source device of the message that receives is an equipment 3;
ACL_b4 is b class acl rule, its matching condition by: is received message and carry unknown unicast sign, and the source device of the message that receives is an equipment 4.
Step 402: each member device calculates the shortest path of self other each member device in the pile system according to current topological connection situation after the topology of pile system is confirmed.
Step 403: member device generates forwarding route table according to shortest path result of calculation, according to forwarding route table the hardware forwarding table item is set.
Step 404:, enable effective acl rule and the effective acl rule in the b class acl rule in a class acl rule according to shortest path result of calculation.Step 403 and 404 execution sequence are in no particular order.
The effective acl rule that enables for stacking opening x comprises:
In a class acl rule, matching condition by the reception message target MAC (Media Access Control) address highest order by 1 and the source device of reception message be the acl rule of stacking opening x place equipment;
In a class acl rule, matching condition by the reception message target MAC (Media Access Control) address highest order by 1 and the source device of reception message be the acl rule of each member device that stacking opening x connects through non-shortest path;
In the b class acl rule, matching condition by the reception message source device that carries unknown unicast sign and institute's reception message belong to the acl rule of equipment for stacking opening x;
In the b class acl rule, matching condition by the reception message source device that carries unknown unicast sign and institute's receptions message be the acl rule that stacking opening x passes through each member device of non-shortest path connection.
Suppose that the shortest path result of calculation among Fig. 2 does, equipment 1 is all walked stacking opening 1 to equipment 2 and equipment 3, walks stacking opening 2 to equipment 4.Effective acl rule of enabling for stacking opening 1 of equipment 1 comprises above-mentioned ACL_a1, ACL_a4, ACL_b1 and ACL_b4 so, and other acl rule does not enable.Effective acl rule that equipment 1 enables for stacking opening 2 comprises above-mentioned ACL_a1, ACL_a2, ACL_a3, ACL_b1, ACL_b2 and ACL_b3.
When topology connection situation changes, enable effective acl rule according to the topology connection situation after changing, can avoid each change in topology all to issue acl rule again like this.
For example; When the link failure between equipment among Fig. 22 and the equipment 3; Form chain topology as shown in Figure 5, then the result of calculation according to new topology connection situation calculating shortest path is: equipment 1 is walked stacking opening 1 to equipment 2, walks stacking opening 2 to equipment 4 and equipment 3.In this case, equipment 1 enables ACL_a1, ACL_a3, ACL_a4, ACL_b1, ACL_a3 and ACL_b4 for stacking opening 1.
Step 405: member device receives the message from other member device in the pile system; According to the effective acl rule that enables for the stacking opening of actual reception message; Judge the message that receives whether be complementary with any effective acl rule wherein, if then execution in step 406; Otherwise, execution in step 407.
Step 406: abandon the message that receives, this flow process finishes.
Step 407: member device is transmitted processing based on self hardware forwarding table item to the reception message, and this flow process finishes.
So far, this flow process finishes.
In order to realize that the above-mentioned pile system that prevents produces the method for loop, the embodiment of the invention also provides the member device in a kind of pile system.Fig. 6 is the structural representation of member device in the embodiment of the invention.As shown in Figure 6, this member device comprises loop inspection unit 62 and retransmission unit 63.
Wherein, loop inspection unit 62 is used for receiving message through stacking opening, judge the message that receives whether be the known unicast message; If then institute is received message and sends to retransmission unit 63; Otherwise, the reception message is carried out the loop inspection, if detect the generation loop, then abandon the message that receives, if do not detect the generation loop, then institute is received message and send to retransmission unit 63.
Retransmission unit 63 is transmitted processing to loop inspection unit 62 message sent.This retransmission unit 63 is realized transmitting according to the hardware forwarding table item.
This member device also comprises message process unit 64, is used to the message interpolation that is received from the pile system outside and piles up heading, writes down source device information and incoming interface information in the heading said piling up.If this message need not be redirected; Then message process unit 64 is searched destination device and outgoing interface for this message; If the message that receives is a unicast message, and do not find the destination device and the outgoing interface of the message that receives, confirm that then the unicast message that is received is the unknown unicast message; Stamp the unknown unicast sign for the unknown unicast message, then message is sent to retransmission unit 63 and transmit processing.Message process unit 64 is when destination device that finds message and outgoing interface, and record destination device information and the outgoing interface information in the heading of piling up at message sends to retransmission unit 63 with message then and transmits processing.If message process unit 64 place member devices are mounted with the application subcard, then this message process unit 64 is also for searching destination device and outgoing interface through using the message that subcard handles, and the operation of carrying out according to lookup result is not repeated in this description with aforementioned identical here.
Owing to carry the unknown unicast sign in the unknown unicast message; Therefore; Loop inspection unit 62 does not carry the unknown unicast sign if judge the message that receives, and is not broadcasting packet when judging whether the message that receives through stacking opening is the known unicast message; In the time of neither multicast message, can judge that then the message that receives is the known unicast message.
Loop inspection unit 62 is carrying out loop when inspection, the source device information that can carry according to receives message, and whether the source device of judging the message that receives is to belong to member device, if, then definite generation loop; Judge stacking opening that this institute of actual reception receives message whether by the source device of institute's receptions message to the corresponding stacking opening of shortest path between the member device of place, if not, then definite generation loop.
Judge in the loop inspection unit 62 institute's message that receives whether by the operation of known unicast message and to the reception message carry out the operation that loop checks and can adopt the mode of mating acl rule to realize.When adopting this implementation, loop inspection unit 62 specifically comprises several modules as shown in Figure 7: pile up that topography module 621, ACL issue module 622, ACL is provided with module 623 and inspection module 624.
Wherein, Pile up topography module 621; Be used for after the topology of pile system is confirmed, calculate the shortest path of place member device other each member device in the pile system, shortest path result of calculation is sent to ACL issue module 622 according to current topological connection situation.
ACL issues module 622, is used for according to shortest path result of calculation, confirms the corresponding acl rule of each stacking opening of place member device, and is handed down to ACL module 623 is set.The corresponding 4 types of acl rules of stacking opening x are specifically set forth in to the description of Fig. 3 aforementioned, omit here.
ACL is provided with module 623, is used to receive ACL and issues the corresponding acl rule of each stacking opening that module 622 issues, and be set to corresponding stacking opening respectively.In physical device, ACL issues module 622 and is the module of software view, and ACL is provided with module 623 and is the module of hardware view.
Issue the time in order further to optimize; Make full use of comparatively sufficient ACL resource, can be when the pile system initialization, each member device issues all acl rules relevant with stacking opening x to self stacking opening x; According to current topological connection situation, enable effective acl rule.When adopting this implementation, loop inspection unit 62 still comprises several modules as shown in Figure 7.The function of piling up topography module 621 is with mentioned above identical.
Under this execution mode, ACL issues module 622 and is used for when initialization, place all corresponding relevant acl rules of each stacking opening of member device is handed down to ACL module 623 is set; All relevant acl rules that stacking opening x is corresponding comprise 2 types of acl rules: a class acl rule and b class acl rule.The particular content of these two types of acl rules is specifically set forth in to the description of Fig. 4 aforementioned, omits here.
This ACL issues module 622 and is also receiving when piling up the shortest path result of calculation that topography module 621 sends; According to shortest path result of calculation; Confirm effective acl rule and the effective acl rule in the b class acl rule in a class acl rule, and notice ACL is provided with module 623.Wherein effectively the particular content of acl rule is specifically set forth in to the description of Fig. 4 aforementioned, omits here.
ACL is provided with module 623 and is used to receive ACL and issues all corresponding relevant acl rules of each stacking opening that module 622 issues, and is set to corresponding stacking opening respectively; When receiving when issuing the notice of module 622, enable the effective acl rule that is provided with into each stacking opening from ACL.
In sum, more than being merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. one kind prevents that pile system from producing the method for loop, is characterized in that this method comprises:
Member device in the pile system receives message through stacking opening, when the reception message is the known unicast message, the reception message is transmitted processing; When the reception message is in broadcasting packet, multicast message or the unknown unicast message any one; The reception message is carried out the loop inspection,, then abandon the message that receives if detect the generation loop; If do not detect the generation loop, then the reception message is transmitted processing;
Wherein, judge institute's message that receives whether for the known unicast method of message by: do not carried unknown unicast and identify when receiving message, and be not broadcasting packet, neither multicast message, then the judgement message that receives is the known unicast message;
Saidly the reception message carried out loop inspection comprise:
The source device information that member device carries according to the reception message; Whether the source device of judging the message that receives is self; If; Then confirm to produce loop; Wherein, Said source device information is recorded in piles up in the heading, and the said heading that piles up is that the incoming interface place member device of message is that message adds;
Whether the stacking opening of judging this institute's reception message of actual reception is that this institute receives the stacking opening of the source device of message to the correspondence of the shortest path between self, if not, then confirm the generation loop.
2. the method for claim 1; It is characterized in that; This method further comprises: the member device of searching destination device and outgoing interface for message; When destination device that does not find unicast message and outgoing interface, confirm that this unicast message is the unknown unicast message, for the unknown unicast message is stamped the unknown unicast sign.
3. method as claimed in claim 2 is characterized in that, this method further comprises: member device calculates the shortest path of self other each member device in the pile system according to current topological connection situation after the topology of pile system is confirmed; According to shortest path result of calculation, issue corresponding acl rule to self each stacking opening respectively;
The acl rule that issues to stacking opening x comprises following 4 types of acl rules:
The matching condition of first kind acl rule by: the highest order of target MAC (Media Access Control) address of reception message be 1, and the source device of the message that receives is a stacking opening x place equipment;
The matching condition of second type of acl rule by: the highest order of target MAC (Media Access Control) address of reception message be 1, and the source device of the message that receives is each member device that stacking opening x connects through non-shortest path;
The matching condition of the 3rd type of acl rule by: is received message and carry unknown unicast sign, and the source device of the message that receives is that stacking opening x belongs to equipment;
The matching condition of the 4th type of acl rule by: is received message and carry unknown unicast sign, and the source device of the message that receives is each member device that stacking opening x passes through non-shortest path connection;
Said judge institute's message that receives whether by the operation of known unicast message and said to the reception message carry out the operation that loop checks and comprise: according to the acl rule that issues for the stacking opening of actual reception message; Judge the message that receives whether be complementary with any acl rule wherein; If then abandon the message that receives; Otherwise, the reception message is transmitted processing.
4. method as claimed in claim 3 is characterized in that, this method further comprises: member device issues all relevant acl rules to self each stacking opening respectively when initialization; The acl rule that issues to stacking opening x comprises following 2 types of acl rules:
The matching condition of a class acl rule by: the highest order of target MAC (Media Access Control) address of reception message be 1, and the source device of the message that receives is to be each equipment of pile system configuration in advance;
The matching condition of b class acl rule by: is received message and carry unknown unicast sign, and the source device of the message that receives is each equipment that disposes for pile system in advance.
5. method as claimed in claim 4 is characterized in that, this method further comprises: each member device calculates the shortest path of self other each member device in the pile system according to current topological connection situation after the topology of pile system is confirmed; According to shortest path result of calculation, enable a class acl rule effective acl rule in the b class acl rule that neutralizes;
The effective acl rule that enables for stacking opening x comprises:
In a class acl rule, matching condition by the reception message target MAC (Media Access Control) address highest order by 1 and the source device of reception message be the acl rule of stacking opening x place equipment;
In a class acl rule, matching condition by the reception message target MAC (Media Access Control) address highest order by 1 and the source device of reception message be the acl rule of each member device that stacking opening x connects through non-shortest path;
In the b class acl rule, matching condition by the reception message source device that carries unknown unicast sign and institute's reception message belong to the acl rule of equipment for stacking opening x;
In the b class acl rule, matching condition by the reception message source device that carries unknown unicast sign and institute's receptions message be the acl rule that stacking opening x passes through each member device of non-shortest path connection;
Said judge institute's message that receives whether by the operation of known unicast message and said to the reception message carry out the operation that loop checks and comprise: according to the effective acl rule that enables for the stacking opening of actual reception message; Judge the message that receives whether be complementary with any effective acl rule wherein; If then abandon the message that receives; Otherwise, the reception message is transmitted processing.
6. the member device in the pile system is characterized in that this member device comprises: message process unit, loop inspection unit and retransmission unit;
Said message process unit is used to the message interpolation that is received from the pile system outside and piles up heading, writes down source device information in the heading said piling up;
Said loop inspection unit is used for receiving message through stacking opening, when the reception message does not carry the unknown unicast sign; And not broadcasting packet; Neither multicast message, judge that then the message that receives is the known unicast message, institute's reception message is sent to said retransmission unit; When the reception message is in broadcasting packet, multicast message or the unknown unicast message any one; The reception message is carried out the loop inspection; The source device information of carrying based on said reception message; Whether the source device of judging the message that receives is the place member device, if then confirm to produce loop; Judge stacking opening that this institute of actual reception receives message whether by the source device of institute's receptions message to the stacking opening that belongs to the shortest path correspondence between the member device; If not; Confirm to produce loop,, then abandon the message that receives if confirm to produce loop; If do not detect the generation loop, then institute is received message and send to said retransmission unit;
Said retransmission unit is used for the message that is received is transmitted processing.
7. member device as claimed in claim 6; It is characterized in that; Said message process unit is further used for searching destination device and outgoing interface for message, if do not find the destination device and the outgoing interface of unicast message; Confirm that then this unicast message is the unknown unicast message, for the unknown unicast message is stamped the unknown unicast sign.
8. member device as claimed in claim 7 is characterized in that, said loop inspection unit comprises and piles up that topography module, ACL issue module, ACL is provided with module and inspection module;
The said topography module that piles up; Be used for after the topology of pile system is confirmed; Calculate place member device shortest path between other each member device in the pile system according to current topological connection situation, shortest path result of calculation is sent to said ACL issue module;
Said ACL issues module, is used for according to shortest path result of calculation, confirms the corresponding acl rule of each stacking opening of place member device, and is handed down to said ACL module is set;
The acl rule that stacking opening x is corresponding comprises following 4 types of acl rules:
The matching condition of first kind acl rule by: the highest order of target MAC (Media Access Control) address of reception message be 1, and the source device of the message that receives is a stacking opening x place equipment;
The matching condition of second type of acl rule by: the highest order of target MAC (Media Access Control) address of reception message be 1, and the source device of the message that receives is each member device that stacking opening x connects through non-shortest path;
The matching condition of the 3rd type of acl rule by: is received message and carry unknown unicast sign, and the source device of the message that receives is that stacking opening x belongs to equipment;
The matching condition of the 4th type of acl rule by: is received message and carry unknown unicast sign, and the source device of the message that receives is each member device that stacking opening x passes through non-shortest path connection;
Said ACL is provided with module, is used to receive said ACL and issues the corresponding acl rule of each stacking opening that module issues, and be set to corresponding stacking opening respectively;
Said inspection module is used for receiving message through stacking opening, according to the acl rule that the stacking opening that be this message of actual reception is provided with, judgement the message that receives whether be complementary with any acl rule wherein, if abandon the message that receives; Otherwise, institute is received message sends to said retransmission unit.
9. member device as claimed in claim 8 is characterized in that, said loop inspection unit comprises that ACL issues module and ACL is provided with module;
Said ACL issues module, is used for when initialization, all corresponding relevant acl rules of each stacking opening in the member device of place is handed down to said ACL module is set; All relevant acl rules that stacking opening x is corresponding comprise following 2 types of acl rules:
The matching condition of a class acl rule by: the highest order of target MAC (Media Access Control) address of reception message be 1, and the source device of the message that receives is each equipment for the pile system configuration;
The matching condition of b class acl rule by: is received message and carry unknown unicast sign, and the source device of the message that receives is each equipment that disposes for pile system;
Said ACL is provided with module, is used to receive said ACL and issues all corresponding relevant acl rules of each stacking opening that module issues, and be set to corresponding stacking opening respectively.
10. member device as claimed in claim 9 is characterized in that, said loop inspection unit further comprise pile up topography module with the inspection module;
The said topography module that piles up; Be used for after the topology of pile system is confirmed; Calculate place member device shortest path between other each member device in the pile system according to current topological connection situation, shortest path result of calculation is sent to said ACL issue module;
Said ACL issues module and is further used for, and when receiving said shortest path result of calculation, according to shortest path result of calculation, confirms a class acl rule effective acl rule in the b class acl rule that neutralizes, and notifies said ACL that module is set;
Effective acl rule of confirming for stacking opening x comprises:
In a class acl rule, matching condition by the reception message target MAC (Media Access Control) address highest order by 1 and the source device of reception message be the acl rule of stacking opening x place member device;
In a class acl rule, matching condition by the reception message target MAC (Media Access Control) address highest order by 1 and the source device of reception message be the acl rule of each member device that stacking opening x connects through non-shortest path;
In the b class acl rule, matching condition by the reception message source device that carries unknown unicast sign and institute's reception message belong to the acl rule of member device for stacking opening x;
In the b class acl rule, matching condition by the reception message source device that carries unknown unicast sign and institute's receptions message be the acl rule that stacking opening x passes through each member device of non-shortest path connection;
Said ACL is provided with module and is further used for, and when receiving when issuing the notice of module from said ACL, enables the effective acl rule that is provided with into each stacking opening;
Said inspection module is used for receiving message through stacking opening, according to effective acl rule that the stacking opening that be this message of actual reception is provided with, judgement the message that receives whether be complementary with any effective acl rule wherein, if abandon the message that receives; Otherwise, institute is received message sends to said retransmission unit.
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